diff --git a/MPChartLib/src/test/java/com/github/mikephil/charting/test/ApproximationTest.kt b/MPChartLib/src/test/kotlin/com/github/mikephil/charting/test/ApproximationTest.kt
similarity index 100%
rename from MPChartLib/src/test/java/com/github/mikephil/charting/test/ApproximationTest.kt
rename to MPChartLib/src/test/kotlin/com/github/mikephil/charting/test/ApproximationTest.kt
diff --git a/MPChartLib/src/test/java/com/github/mikephil/charting/test/AxisRendererTest.kt b/MPChartLib/src/test/kotlin/com/github/mikephil/charting/test/AxisRendererTest.kt
similarity index 100%
rename from MPChartLib/src/test/java/com/github/mikephil/charting/test/AxisRendererTest.kt
rename to MPChartLib/src/test/kotlin/com/github/mikephil/charting/test/AxisRendererTest.kt
diff --git a/MPChartLib/src/test/java/com/github/mikephil/charting/test/BarDataTest.kt b/MPChartLib/src/test/kotlin/com/github/mikephil/charting/test/BarDataTest.kt
similarity index 100%
rename from MPChartLib/src/test/java/com/github/mikephil/charting/test/BarDataTest.kt
rename to MPChartLib/src/test/kotlin/com/github/mikephil/charting/test/BarDataTest.kt
diff --git a/MPChartLib/src/test/java/com/github/mikephil/charting/test/ChartDataTest.kt b/MPChartLib/src/test/kotlin/com/github/mikephil/charting/test/ChartDataTest.kt
similarity index 100%
rename from MPChartLib/src/test/java/com/github/mikephil/charting/test/ChartDataTest.kt
rename to MPChartLib/src/test/kotlin/com/github/mikephil/charting/test/ChartDataTest.kt
diff --git a/MPChartLib/src/test/java/com/github/mikephil/charting/test/DataSetTest.kt b/MPChartLib/src/test/kotlin/com/github/mikephil/charting/test/DataSetTest.kt
similarity index 100%
rename from MPChartLib/src/test/java/com/github/mikephil/charting/test/DataSetTest.kt
rename to MPChartLib/src/test/kotlin/com/github/mikephil/charting/test/DataSetTest.kt
diff --git a/MPChartLib/src/test/java/com/github/mikephil/charting/test/LargeValueFormatterTest.kt b/MPChartLib/src/test/kotlin/com/github/mikephil/charting/test/LargeValueFormatterTest.kt
similarity index 100%
rename from MPChartLib/src/test/java/com/github/mikephil/charting/test/LargeValueFormatterTest.kt
rename to MPChartLib/src/test/kotlin/com/github/mikephil/charting/test/LargeValueFormatterTest.kt
diff --git a/MPChartLib/src/test/java/com/github/mikephil/charting/test/ObjectPoolTest.kt b/MPChartLib/src/test/kotlin/com/github/mikephil/charting/test/ObjectPoolTest.kt
similarity index 100%
rename from MPChartLib/src/test/java/com/github/mikephil/charting/test/ObjectPoolTest.kt
rename to MPChartLib/src/test/kotlin/com/github/mikephil/charting/test/ObjectPoolTest.kt
diff --git a/app/src/androidTest/java/info/appdev/chartexample/PieTest.kt b/app/src/androidTest/kotlin/info/appdev/chartexample/PieTest.kt
similarity index 100%
rename from app/src/androidTest/java/info/appdev/chartexample/PieTest.kt
rename to app/src/androidTest/kotlin/info/appdev/chartexample/PieTest.kt
diff --git a/app/src/androidTest/java/info/appdev/chartexample/StartTest.kt b/app/src/androidTest/kotlin/info/appdev/chartexample/StartTest.kt
similarity index 100%
rename from app/src/androidTest/java/info/appdev/chartexample/StartTest.kt
rename to app/src/androidTest/kotlin/info/appdev/chartexample/StartTest.kt
diff --git a/app/src/androidTest/java/info/appdev/chartexample/ViewPagerTest.kt b/app/src/androidTest/kotlin/info/appdev/chartexample/ViewPagerTest.kt
similarity index 100%
rename from app/src/androidTest/java/info/appdev/chartexample/ViewPagerTest.kt
rename to app/src/androidTest/kotlin/info/appdev/chartexample/ViewPagerTest.kt